Does anyone have any experience with this Benq external drive i.e. burn quality and burn speed vis a vis the 1640 or 1650 series?
It’s a 1640, just external.
Yes I have an external BenQ164B BEFB firmware. It is like was said above, it a just a 1640 that can be crossflashed to run at UDMA 4, its a great drive.
My 1640 crossflashed to a EW164B - used internally - is a very good reader/ripper and writer - as you can see below - I have it working with a LG 4167B - and the combo is awesome IMO-